From aba3abf1b6dd181a2a644cd2f6f3cd56cd8bfff4 Mon Sep 17 00:00:00 2001
From: Nick Burch <nick@apache.org>
Date: Tue, 13 Jun 2006 14:54:52 +0000
Subject: [PATCH] Some PersistPtrHolders seem to reference records stored after
 them. Add a second pass to cope with these cases

git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@413911 13f79535-47bb-0310-9956-ffa450edef68
---
 .../org/apache/poi/hslf/HSLFSlideShow.java    | 33 ++++++++++++++-----
 .../poi/hslf/record/PersistPtrHolder.java     |  4 ++-
 2 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/src/scratchpad/src/org/apache/poi/hslf/HSLFSlideShow.java b/src/scratchpad/src/org/apache/poi/hslf/HSLFSlideShow.java
index 966ebe7fd4..ddf9c7520e 100644
--- a/src/scratchpad/src/org/apache/poi/hslf/HSLFSlideShow.java
+++ b/src/scratchpad/src/org/apache/poi/hslf/HSLFSlideShow.java
@@ -248,25 +248,42 @@ public class HSLFSlideShow extends POIDocument
 	// As we go along, update, and hand over, to any Position Dependent
 	//  records we happen across
 	Hashtable oldToNewPositions = new Hashtable();
-
-	// Write ourselves out
+	
+	// First pass - figure out where all the position dependent
+	//   records are going to end up, in the new scheme
+	// (Annoyingly, some powerpoing files have PersistPtrHolders
+	//  that reference slides after the PersistPtrHolder)
 	ByteArrayOutputStream baos = new ByteArrayOutputStream();
 	for(int i=0; i<_records.length; i++) {
-		// For now, we're only handling PositionDependentRecord's that
-		//  happen at the top level.
-		// In future, we'll need the handle them everywhere, but that's
-		//  a bit trickier
 		if(_records[i] instanceof PositionDependentRecord) {
 			PositionDependentRecord pdr = (PositionDependentRecord)_records[i];
 			int oldPos = pdr.getLastOnDiskOffset();
 			int newPos = baos.size();
 			pdr.setLastOnDiskOffset(newPos);
-			//System.out.println(i + "  " + oldPos + " " + newPos);
 			oldToNewPositions.put(new Integer(oldPos),new Integer(newPos));
+			//System.out.println(oldPos + " -> " + newPos);
+		}
+		
+		// Dummy write out, so the position winds on properly
+		_records[i].writeOut(baos);
+	}
+
+	// No go back through, actually writing ourselves out
+	baos.reset();
+	for(int i=0; i<_records.length; i++) {
+		// For now, we're only handling PositionDependentRecord's that
+		//  happen at the top level.
+		// In future, we'll need the handle them everywhere, but that's
+		//  a bit trickier
+		if(_records[i] instanceof PositionDependentRecord) {
+			// We've already figured out their new location, and
+			//  told them that
+			// Tell them of the positions of the other records though
+			PositionDependentRecord pdr = (PositionDependentRecord)_records[i];
 			pdr.updateOtherRecordReferences(oldToNewPositions);
 		}
 
-		// Finally, write out
+		// Whatever happens, write out that record tree
 		_records[i].writeOut(baos);
 	}
 	// Update our cached copy of the bytes that make up the PPT stream
diff --git a/src/scratchpad/src/org/apache/poi/hslf/record/PersistPtrHolder.java b/src/scratchpad/src/org/apache/poi/hslf/record/PersistPtrHolder.java
index bdf6251c29..418e4ed539 100644
--- a/src/scratchpad/src/org/apache/poi/hslf/record/PersistPtrHolder.java
+++ b/src/scratchpad/src/org/apache/poi/hslf/record/PersistPtrHolder.java
@@ -192,7 +192,9 @@ public class PersistPtrHolder extends PositionDependentRecordAtom
 			Integer newPos = (Integer)oldToNewReferencesLookup.get(oldPos);
 
 			if(newPos == null) {
-				throw new RuntimeException("Couldn't find the new location of the \"slide\" that used to be at " + oldPos);
+				System.err.println("Couldn't find the new location of the \"slide\" with id " + id + " that used to be at " + oldPos);
+				System.err.println("Not updating the position of it, you probably won't be able to find it any more (if you ever could!)");
+				newPos = oldPos;
 			}
 
 			// Write out the new location
-- 
2.39.5